Performance Product Technologies helps you quickly locate the correct Lower Unit for your Mercury or Mariner Outboard Motor. We have been the leading online supplier of Lower Units since 2002. We are proud to stand behind our Mercury Marine Outboard Lower Units as a Platinum Level dealer for Mercury Marine. We stock new and remanufactured lower units for 2 stroke and 4 stroke outboard motors from 25 to 300 Hp. We specialize in the full range of outboard lower units ranging from 1985 year model outboard motors all the way up to the newer 4 stroke outboard motors. Select the chart below to view and match up your lower unit model by serial number range.